Roll grinding machine



Aug. 27, 1968 ROHRER 3,398,489

I ROLL GRINDING MACHINE Filed Feb; 1966 2 Sheets-Sheet l INV'ENTOR.

FIG 2 EDWIN H. ROHRER ATTC'RNEY I g- 9 E. H. ROHRER ROLL GRINDINGMACHINE 2 Sheets-Sheet 2 Filed Feb. 5, 1966 INVENTOR. EDWIN H. ROHRER520 o ow BY WQ ATTORNEY United States Patent 01 hce 3,398,489 PatentedAug. 27, 1968 ABSTRACT OF THE DISCLOSURE A roll grinding machine forradial type crowning in which the grinder pivots as well as in-feeds sothat the grinding surface is tangent to the roll face being ground atall times.

This invention relates to a cylindrical grinding machine and moreparticularly to a grinding machine for contouring rubber covered rolls.

The principal object of the invention is the provision of'a rollgrinding machine capable of variable roll contouring.

A further object of the invention is the provision of a roll grindingmachine for radial type crowning in which the grinder pivots as well asin-feeds so as to be tangent to the roll face at all times.

Afurther object of the invention is the provision of a roll grindingmachine comprising a variable cam actuated device wherein the cams arereadily replaceable to change to a parabolic shape and an hour glassshape.

A still further object of the invention is the provision of a rollgrinding machine wherein the degree of crown on the roll being groundmaybe varied from a flat to a maximum curve by simple manual adjustment ofthe machine.

The roll grinding machine disclosed herein comprises a variable rollcontouring device which is actually a device for moving a grinding wheelor wheels in an arcuate path transversely of a roll to be ground and inparticular a roll having arubber cylindrical sleeve thereon as known inthe art. In order to form an even crown, the grinding wheels must betraversed longitudinally of the roll while the roll is being rotated andthe grinding wheels must change their position relative to the face ofthe roll being ground so as to continuously match the crown shapethereof.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combinationarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being the intention to cover all changes andmodifications of the example of the invention herein chosen for purposesof the disclosure, which do not constitute departures from the spiritand scope of the invention.

The invention is illustrated in the accompanying drawing, wherein:

FIGURE 1 is a perspective view of the roll grinding machine.

FIGURE 2 is an enlarged horizontal section on line 22 of FIGURE 1.

FIGURE 3 is a diagrammatic top plan view as indicated by the lines 3-3on FIGURE 1.

FIGURE 4 is a diagrammatic top plan view similar to FIGURE 3 andillustrating an exaggerated crown on a roll being ground and alternatepositions of the grinding wheels and the apparatus for adjusting thesame relative to the roll surface.

By referring to the drawings and FIGURES 1 and 2 in particular, it willbe seen that the roll grinding machine comprises a main base supportinga carriage base 11. The carriage base 11 includes spaced longitudinallyextending parallel ways 12 on which a carriage 13 is mounted onanti-friction devices engaging the ways 12 as will be understood bythose skilled in the art. The carriage 13 carries a relatively movablehead 14 which in turn supports a grinding device such as abrasive wheels15 rotatably mounted on a shaft 16 and driven by a gear box 17 which ispowered by an attached electric motor 18.

In FIGURES 1 and 2 of the drawings a roll 19, of a cylindricalconstruction, is illustrated and is provided with a rubber sleeve 20.The roll 19 is rotatably supported by a head stock 21 and tail stock 22,the latter comprising a commercial live center type. The head stock 21and tail stock 22 are supported on a subbase 23 which in turn isslidably mounted on the main base 10 to adjust for roll diameter andgrind depth. Means for rotating the roll 19 comprises a hydraulic motorbuilt into the head stock 21 arranged to drive a conventional face plateas will he understood by those skilled in the art.

By referring again to the carriage base 11 it will be observed thatthere is a longitudinally extending traversing screw 24 journalled atits opposite ends in brackets on the carriage base 11 and threadablyengaging appropriate configurations in depending portions of thecarriage 13 so that revolving motion imparted the traversing screw 24will cause the carriage 13 to move longitudinally of the ways 12 on thecarriage base 11.

Positioned alongside the traversing screw 24, there is a contourcontrolling bar 25 which is slidably positioned relative to a pair ofsupporting slide pieces 26 which are positioned on the carriage base 11between the ways 12. The bar 25 is pivoted midway between its ends tothe carriage base 11 as best seen in FIGURES 3 and 4 of the drawings andprovided at one of its ends with a depending threaded aperture which isengaged on a transversely positioned screw 27 which may be rotated byhand wheel 28 on the carriage base 11.

The head 14 which carries the grinding Wheels 15 as hereinbeforedescribed is pivotally mounted on the carriage 13 and includesoppositely disposed sidewardly extending arms 29 and 30' which in turnhave rollers 29A and 30A mounted thereon and arranged to engage cams 31and 32 which are each pivoted to the carriage 13 and interconnected by alink 33 as best illustrated in FIG- URES 3 and 4 of the drawings. Thecam 31 has a sidewardly extending arm 34 keyed to the pivot shaft bywhich the cam 31 is pivoted to the carriage 13 and the outer end of thearm 34 is pivotally engaged on a bracket 35 which in turn has secondaryrollers 36 on its opposite ends engaging the opposite sides of the bar25 heretofore referred to.

By referring now to the diagrammatic FIGURES 3 and 4 of the drawings itwill be seen that in FIGURE 3 the head 14 which supports the grindingwheels is positioned midway between the ends of the roll 19 and thebroken line representations of the grinding wheels 15 are perpendicularrelative to the axis of the roll 19. The earns 31 and 32 are engagingthe rollers 29A- and 30A respectively and so that the configuration ofeach of the earns 31 and 32 is the same and the spacing effect resultingbetween the carriage 13 to which the cams 31 and 32 are pivoted and therollers 29A and 30A is equal. The head 14 is accordingly perpendicularto the axis of the roll 19. At such time as the carriage 13 carrying thehead 14 which in turn carries the grinding wheels 15 moves to the rightas illustrated in FIGURE 4 in solid lines, the predetermined angularposition of the bar 25 will cause the bracket 35 and the rollers 36thereon which are following the same to tilt the earns 31 and 32 bymotion imparted through the arm 34. It will thus be seen that when thecarriage 13 moves to the right as in solid lines in FIGURE 4 of thedrawings the changing positions of the cams 31 and 32 result in thechanged position of the head 14 and it will be seen that this continuesprogressively as the traversing action of the carriage 13 continues. i

By referring now to the broken line illustration to the left of FIGURE 4of the drawings, it will be seen that when the carriage 13 moves to theleft of the center of the roll 19 the relatively increased space betweenthe angularly disposed bar 25 and the cams 31 and 32 on the carriage 13results in the bracket 35 moving the arm 34 to tilt the cams 31 and 32in a manner opposite to that heretofore described. This opposite tiltingmotion turns the head 14 in a direction opposite to that heretoforedescribed and as a result acts to maintain the grinding wheels tangentto the roll face as the traversing action of the carriage 13 continues.

It will thus be seen that the degree of crown imparted to the roll 19depends upon the relative position of the bar 25 and that depending onthe position of the bar 25 the roll can be ground flat or to any desiredcrown and that the same may be readily varied by manually turning thehand wheel 28 which in turn controls the screw 27 positioning the bar 25relative to the axis of the roll.

It will further be seen that the shape of the earns 31 and 32 and thefact that they are oppositely disposed with respect to one another isimportant and necessary and that the principal point of novelty in thedisclosure is the arrangement of the cams 31 and 32 and their relativeengagement with the rollers 29A and 30A on the ends of the arms 29 and30 of the rotatable head 14 on which the grinding wheels 15 are located.

It will thus be seen that a variable cam-actuated device for a radialtype crowning in which the grinder pivots as well as in-feeds so as tobe tangent to the roll base at all times has been disclosed and havingthus described my invention, what I claim is:

1. A roll grinding machine comprising a base, a grinding device and arotatable work support which are movable relative to each other, alongitudinally movable carriage, a horizontally disposed pivotallymounted support on said carriage for supporting said grinding device forturning movement in a horizontal plane, means to impart turning motionto said pivotally mounted support to cause said pivotally mountedsupport and said grinding device thereon to turn relative to saidcarriage when said carriage is moved longitudinally of said rotatablework support and base, said means including at least one cam rotatablymounted on said carriage, a cam follower oris'aid'pivotally mountedsupport engaging said cam and means for moving said cam relative to saidcarriage when said carriage moves longitudinally of said work supportand base.

2. The roll grindingmachine set forth in claim 1 and wherein said meansfor moving said cam-comprises an elongated bar positioned longitudinallyof said work support and base and means movably engaging said bar andconnected with said cam.

3. The roll grinding machine set forth in claim 1 and wherein said camis rotated in timed relation with said longitudinal movement'of saidcarriage. i

- 4. The roll grinding machine set forth in claim 1 and wherein saidmeans for moving said cam comprises an elongated bar pivoted midwaybetween its ends to said base so as to be movable to various angles withrespect to said base and means movably engaging said bar and connectedto said cam and arranged to impart rotary motion to said cam relative tothe angle of said bar on said base when said carriage moveslongitudinally of said base.

5. The roll grinding machine set forth in claim 1 and wherein there aretwo cams rotatably mounted on said carriage in spaced relation to oneanother, means interconnecting said cams, and wherein there are two camfollowers on oppositely disposed arms on said pivotally mounted supportengaging said cams.

6. The roll grinding machine set forth in claim 1 and wherein saidrotatable work support is arranged to support a crowned rubber coveredroll in spaced parallel relation to said longitudinally movable carriageand wherein said grinding device and pivotally mounted support thereforare arranged to maintain tangential relation between said grinding wheeland said crowned roll.

References Cited UNITED STATES PATENTS Bowen 51-42 a LESTER M. SWINGLE,Primary Examiner.

